Improvement in the manufacture of railroad-car wheels



J. D. MURPHY. WROUGHT AND CAST IRON WHEELS.

No. 47,780. Patented May 167, 1865.

mguonms PETERS 60., PRDYO'LITNOV. wunmamn n wearing rivet itself.

UNITED STATES PATENT; OFFICE.

JOHN D. MURPHY,OF BAL TIM OR E, MARYLAND.-

IMPROVEMENT IN THE MANUFACTURE OF RAILROAD-CAR WHEELS.

Specification forming part of Letters Patent No. 47,780, dated May 16, 1865.

To all whom it may concern Be it known that I, JOHN DVMURPHY, a citizen of the United States, and a resident of Baltimore city, in the State of Maryland, have" invented new and useful improvements in the mode of making combined wrought andcast iron wheels for carriages, wagons, railroadcars; gun-carriages, and for whatever pulposes to which wheels are applicable; and I do hereby declare that the following is a full and exfact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon. V To enable others skilled in the art to make and use my invention,'I will proceed to vdescribe it entire.

The following is the mode of manufacture: First. After the spokes are cut to'the requiredlength, I thenproceed to flatten and spread them atone end, so as not only to give to them a more extended bearing-surface in the cast metal or hub, but at the same time to give them the great advantage of a dovetail form, as shown on plan at A in Figs. 1 and 3. On the other'end is then formed what is also herein claimed, the shoulder and dowel, which in a heated state, is to be riveted into the conical or tapered cavity prepared to receive itin .the rim or tire before the hub is cast, (at B in Figs. 1 and 3.) The object of this form of rivet is not only to furnish one that will. bear the wear of rim or tire without failing to bea rivet, but at the same time that willby the process of The riveting of the spokes is so performed as to give to the wheel whatever dish may be required. The tire being left 'open at the V weld, as shown at A, Fig. 2, the skeleton isthen ready for the mold. (See Fig. 4.) y

Second. To prevent the possibility of failure in the amalgamation of the two metals, reseryoirs are formed in the mold, one on each side, or more, if required, to receive the surthe spokes. The .gates to those chambers .or reservoirs are so placed that the wrought-iron heated, thus allowing'th'e gases produced by without rising through the upper metal, which of small cavities.

Having described my improvements, I wish as set forth. 7

2. Pouring a stream 'of melted metal over the flattened and expanded ends of the spokes, and permitting it to pass freely away from them until said expanded ends shall have attained to a high degree of heat, and then allowing the mold to fill and the metals to unite with eachother, substantially as specified.

- JOHN D. M RPH VVit-nesses JOHN D. BLOOR,

JOHN S. HoLLINcs'HEAn plus metal used in heating the spokes, placed and constructed. with small gates, so.as to fill very slowly, thereby giving'not only time, but also a constant flowof fresh hot metal to heat or spokes are not covered until thoroughly the combination of the two metals to pass ofi I would otherwise leavethe hub porous-and full to be distinctly understood as claiming nothing ed opposite ends of the spokes. substantially. 

